Excavator trip



A. QRLQFF EXGAVATOR TRIP June 10, 1930.

Filed March 30, 1928 A TTORNEYJ Patented June 10, 1930 untrue STATESPATENT orrica ARTHUR ORLOFF, OF GREEN BAY, WISCONSIN, ASSIGNOR TONOE'IHW'EST ENGINEER- ING CORPORATION, OF GREEN BAY, WISCONSIN, ACORPORATION OF WISCONSIN EXCAVATOR TRIP Application filed March 30,1932i. Serial No. 265,969.

The invention relates to dipper trips.

One object of the invention is to provide a dipper trip mechanism forthat type of excavator in which the dipper is drawn through the materialto be excavated while being guided on a boom, the trip mechanismembodying the invention being so constructed and arranged that theoperator may effect the dumping of the dipper with a minimum of inmanual effort and independently of the position of the dipper intranslation along the boom.

A further object of the invention is to provide dipper trip mechanism ofsimple construction.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims at the con-- clusionhereof.

In the drawings Fig. 1 is an elevation view of the trip mechanismembodying the invention;

Fig. 2 is a detail sectional view taken on the line 2-2 of Fig. 1.;

Fig. 3 is a detail elevation view show ing the dipper in dischargingposition.

In the drawings the numeral 4 designates a boom, here shown as pivotedat 5 to a frame member 6 associated with the rotating base 7 30 of anexcavator of known construction where in said rotating base is supportedon a travelling base 8 provided with endless propelling treads 8. Theboom is raised and lowered in any suitable manner through a hoistingcable 9 associated with the outer end of the boom and with a drum (notshown) on the machine.

The boom is provided with spaced trackways 10, receiving rollers 11mounted on a carriage 12 carrying thedipper body 13. The dipper isequipped with a bottom dumping door 14 pivoted to the sides thereof at15 and usually provided with digging teeth 16.

The rear end ofthe dipper door carries a locking lug or catch 17 whichextends up into an opening 18 in the back end of the dipper and isengageable with a latch 19 pivoted to the back end of the dipper at 20and operatively connected intermediate its ends by a link 21 to theshort arm of a bell crank lever 22. The lever 22 is pivotally mounted onthe rear side of the dipper at 23 and its longer arm 24 is adapted toengage an adjustable stop screw 25 mounted on the back of the dipper. Alatch-closing spring 26 is secured at one end to the latch beyond itspivot and at the other end 27 to the back of the dipper. lVith thisconstruction, when the arm 24 of the lever 22 is raised the latch 19 ismoved to the dotted line position shown in Fig. 2 against the tension ofthe spring 26 and the door is free to swing out under the influence ofgravity and its load to the dotted line position shown in Fig. 3, theboom 4 having been raised and moved to a desired position. After thedischarge of the load the boom is manipulated to cause the door of thedipper to move to a closing position and as the curved face 17 of thecatch engages the curved face 28 of the latch 19 said latch is swung outagainst the tension of the spring 26 until it can snap in under thecatch 17 where it is held by the spring 26.

In order to trip the dipper at any position along the boom, I haveprovided a cable 29 dead-ended at 30 atthe outer end of the boom,extending rearwardly over a pulley 31 journalled on a shaft 32projecting from the carriage, thence downwardly and around a pulley 33carried on a shaft 34 supported in the outer forked end 24- of the arm24 of the lever 22, thence extending upwardly over a pulley 35journalled on shaft 32 and rearwardlv to a lever 36 pivoted at 37'adjacent the hinge point of the boom which is just behind the lower endof an arm 38 of said lever: The

. arm .38 is adapted to be connected in any suitable. manner to a1nanually-controlled lever 39, here shown as a hand-lever pivotedintermediate its ends at 40 on the machine and connected at its lowerend 4.1 by a cable 42 with the outer or lower end of the arm 38.

The dipper is moved out along the boom by means of a cable or dragline43, connected to the dipper or its carriage and extending over a pulley44 at the outer end of the machineand then in known manner to a drum(not shown) on the machine, by winding in the cable 43 on said drum.

During the digging operation, as the dip per moves out along the boomunder the ac tion of the cable 43, the cable 29 is free to run betweenthe pulleys 31, 33 and 35 and hence when the parts are in the positionshown in Fig. 1 the trip mechanism does not move, the hand-lever beingthen in an inoperative position.

IVhen, however, the dipper has been filled, the boom elevated to theproper height for dumping, and the dipper moved over the spot where itis desired to discharge its contents, a forward swing of the. upper endof the lever 39, will, through cable 42 and lever 38, put a tension onthe trip cable 29 which in turn will cause that portion of the tripcable looped over the pulley 33 between the pulleys 31 and 35 toshortenfthus raising the outer end of the bell crank lever 22, causinglatch 19 to move out to the right, outside of contact with the catch 17,thus leaving the dipper door 14 free to swing about its pivot 15 anddump the contents of the dipper.

A spring or weight 45 may be associated with the arm 24 to move thelever 24 to its inoperative position and resist any slight tension inthe cable 29 during the movement of the dipper along the boom.

I desire it to be understood that this invention is not'to be limited toany specific form or arrangement of'parts except in so far as suchlimitations are included in the claims.

WVhat Iclaim as my invention is:

1. In an excavator, the'combination with a boom, a dipper mounted totraverse said boom and provided with a dumping door, of lockingmechanism for said door, a trip cable extending lengthwise of the boom,

-means connecting said cable with said looking mechanism, permittingfree translation of said dipper along the boom with a free movement ofsaid dipper along said cable, and means under the control of theoperator to tension said trip cable to release said locking mechanism.

2. In an excavator, the combination with a boom, a dipper mounted totraverse said boom and provided with a dumping door, of lockingmechanism for said door, a trip cable extending lengthwiseof the boomand having a loop connect-ion with said mechanism permitting'freetranslation of said dipper along the boom without operating said lockingmechanism, and means for tensioning said cable 'to shorten said loopconnection to release said locking mechanism.

3. In an excavator, the combination with a boom, a dipper mounted totraverse said boom and provided with a dumping door, of lookingmechanism for said door including a latch and an actuating member forsaid latch, a trip cableextending along the boom and having a freerunning portion associated with said actuating member, and means fortensioning said cable to move said actuating member to release saidlatch.

4. In an excavator, the combination with a boom, a dipper mounted totraverse said boom and provided with a dumping door, of lockingmechanism for said door including a latch, a lever for releasing saidlatch, means a providing a loop in said cable between said dipper andsaid lever, and means for tensioning said cable to shorten said loop tomove said lever and release said latch.

5. In an excavator, the combination with a pivoted boom, a dippermounted to traverse the boom and provided with a dumping door, oflocking mechanism for said door, a trip cable extending from the outerend of said boom to the pivot point thereof, means connecting said cablewith said locking mechanism permitting free translation of said dipperalong the boom with a free movement of said dipper along said cable, andoperatorcontrolled means associated with the boom pivot end of saidcable for'tensioning the same to actuate said locking mechanism.

6. In an excavator, the combination with a pivoted boom, a dippermounted to traverse the boom and provided with a dumping door, oflocking mechanism for said door, a trip cable extending lengthwise ofthe boom from its outer end to its pivot point and having a loopconnection with'said mechanism permitting free translation of. saiddipper along the boom without operating said locking mechanism, a leversecured to the inner end of said trip cable, and a manually-controlledlever on the machine operatively connected to said'lever to swing thesame to tension said cable and shorten said loop connection to ac tuatesaid locking mechanism.

In testimony whereof I aflix my signature.

ARTHUR ORLOFF.

